Abstract: The problem of corrosion and leakage of the heat exchanger of the parking air conditioner is serious. The reasons for the corrosion and leakage of the heat exchanger are studied by means of microscopic observation and component detection, and the corrosion resistance of the heat exchanger after anti-corrosion treatment is studied. The research shows that the leakage of the heat exchanger is caused by the pitting and perforation caused by Cl^- and S^2-. The heat exchanger was immersed in water-based resin coating, and then treated by air drying and high temperature curing. The corrosion of the heat exchanger after anticorrosion and anticorrosion treatment was compared by neutral salt spray test and SWAAT test. The experimental results show that the corrosion resistance of heat exchanger coated with water-based resin coating is significantly improved, which provides effective ideas for the design of anti-corrosion process of heat exchanger products.

Key words: Aluminium alloy condenser, Pitting corrosion, Antiseptic treatment, Corrosion resistance